Vibrating device



Nov 3 H. HURM VIBRATING DEVICE med umh. 25, 1922 PatentedNov. 3, 19.25'.

UNITED STATES HORACE HURM, 0F PARIS, FRANCE.

To all whom t may concern.'

Be it known that I, Horace HUnM, citizen of the French Republic, residing at Paris, France, have invented certain new and useful Improvements in Vibrating Devices, of which the following is a specification.

This invention relates to vibrating devices provided with tension springs and refers more particularly, although not exclusively, tosound boxes for phonographs provided with such springs, as it is in the case of these' sound boxes that the improvementsv forming the subject of the invention appear to be of the greatest importance.

The chief object of the invention is soto construct devices of this character that they function more satisfactorily than has hitherto been the case.

The invention consists essentially in providing, as the spring member of such a device, a simple wire so formed and arranged and made from such material' that, when suitably stretched, it possesses the required elasticity.

In addition to the principal feature just mentioned, the invention includes various details, which are preferably utilized at the same time and which will be more fully described hereafter.

It also relates to a special constructional embodiment, in which the invention is applied to the sound box of a phonograph andl it includes, as new industrial products, devices of the character mentioned embodying the said improvements, and special parts suitable for their construction.

In order that the invention may be clearly understood, it will now be described with reference to the accompanying drawing, but it is to be pointed out that the description and drawing are given merely by way of example. e I

Figs. l and 2 of the said drawing, show respectively, in front elevation and in axial section, a sound box for a phonograph eme bodying the invention.

Fig. 3 is a plan view of the tensioning or loop member and associated parts.

Figs. 4, 5 and 6 are sections on an enlarged scale on the lines M Fig. l, 5-5, Fig. 2 and 6 6, Fig. 2, respectively, illustrating certain parts utilized in the construction of the sound box.

The invention is shown as applied to a sound box of the kind having a stylus bar al shaped as a strutted beam. The stylus vbar VIBRATING DEVICE.

Application filed March 25, 1922. Serial No. 546,930.

is provided adjacent its outer end di with a small transverse member (Z2, in which are formed symmetrically placed shallow depressionsat equal distances on each side of the central plane of the device. These depressions are so arranged that they enable the stylus bar to be pivotally mounted upon the casing Z), which casing carriesthe vibrat ing diaphragm For the purpose of this pivotal mounting, two small screws f are employed, screwing through small pillars g carried by the outer face of the box (l). Z3 is a hook and ,7' is a connection` for holding the stylus bar upon its pivots and for press ing the inner end thereof upon the diaphragm a. This connecting member y7' connects the hook Z3 and a pillar 7c, which pillar projects from the face of the casing diametrically opposite a point midway between the pillars g, and, in the usual construction, a spring is provided for attaching the member j to the column 7c.

The portions of the device, other than those already mentioned forv holding the stylus bar d in pivotal connection upon the box l) and for enabling it to exercise an elas` tic pressure upon the centralportion of the diaphragm a, may be of any suitable construction.

The transverse members d2, contrary to what has been the practice hitherto, is preferably made from the same material as the stylus bar itself. It may, with advantage, be made from duralumin as has usually been the case with the stylus bar, and it may be riveted thereto. y

The shallow depressions formed in the transverse member d2, may also, in place of coming directly upon the ends of the screws, as has been usual hitherto, have small pads, preferably of fibre, contained therein, upon which the points of the screws bear. These portions of the construction are preferablyl such as shown clearly at Figs. `l, 2 and 6.

Instead of making the connecting member j of a cord and spring connection, as has previously been the case,I now propose to make the same from a stretched thread, pref-- erably a metal wire, which, when properly stretched, gives the required elasticity.

Instead of connecting the member j to the pillar 7c on the casing by means of a spring, as hasbeen previously proposed, I provide a rigid device forxeffecting the attachment.`

According to my present invention, I

form the connecting member and the rigid device as follows i i I take a length of steel wire, such as piano wire, say of 1.5 tenths of a millimeter in diameter, or I may take hardenedsilver;| wire, say of two tenths of a millimeter in diameter. This is bent back upon itself ori into the shape of a U to extend over the hook d3 as will be clearly seen.` -lIe also provide a small bar or block j1 which is rfurnished with two perforations, through which the free extremities of the wire can be threaded. The. bar or blockj1 isalso formed with screw threaded holes extending.substantially at a right angle to and transversely ofthe first mentioned holes, to receive locking screws j2, the construction being. such that the ends of these screws push the inserted' wires into bottoms ofthe holes and retain them firmly in positionwithiu the said holes.

I attach tov the block or bar one extremityfof a screw threaded rod This. rod has a groove extending alongV its `length corresponding with ongelposition of 'its gen-` erating` line. i

In some cases, contrary to whatv is shown upon thedrawi'ng, the' rod may havev itsj axis parallelto the axes ofthe holes or conduits through which' the wirespass.v I pre.-l fer, however, to connect the rod jq tothe block j1 las shown in the drawing so that the, axis of the rod is perpendicular to the plane passing through theaxes ofthe holes.` In this way,'when the extremities, 'of the wires have been placed in position, the loopy is s turned: over so that= thesaidloop and the rod extend 'in parallel directions on o posite sideof2 the bar or block. The groove brined on the surface of the bar is alsoturned' into such a position that it corresponds to the position yof fthe generating line" nearest tothe parts ofthewire j.

' The pillarcl is provided with a plain hole through which the rodl can slide freely. It is also' providedwith a screw threaded hole aty substantially a right anglfe'to the axis of the first mentioned: hole, 'and a locking screw-e701 screws intof the last' mentioned hole. In this way when the rodfjI has been. placed in position andthe screw c1` is screwed in to enter the groove in the rod-,the rod is, pree vented from lrotating4 but vis 'free Ito slide longitudinally; i

j4 isl Ia nut adapted to screw on to the end ofthe rodA j3T and to bear against the pillar. 7c oragaiiist any interposed washer. i In this wey e 'peil eeh' be.. exerted epee the fed" .t ene @Gesamte epee. 'am "wire" loep.' i, which latter canl he""stifctched; to anyL required degree. v "In this' way, when all the parts are accu-v rat'ely`Y fitted and. by suitable turnf i-ngth'e' nutl jt; a Vsound,hbx' i'sfobt'ainedca-V pable of? delicate regulation and giving the ineet resulte Moreover, owing te die. menner in which the resilient member is made .itl eliminates; the greater. part` of'the secondary vibrations.

In some cases I provide pads jO upon the wire` ja These pads are of buffering or deadening material from the acoustical pointeoffview, for instance of rubber. They more completely eliminate secondary vibrations and prevent all-risk of contact between the wires and the stylus bar d, .andto acer-` tain extent clamp this latter laterally/So that it is prevented fromvibratinglaterally, while being left free to vibrate in its own plane of symmetry, the said` pads in the latter case functioning asV rollers, which turn upon their own axes under the action of the friction exerted uponv them byfthe side faces ofthe stylusfbar.r

As will be clearly understood'and as already been remarked, the invention is not limited in any way to those methods of construction or to 'those details which have,

b'een particularly described, but include'sfall'.

modifications coming within afair interpretation of my4 claims. Y l

lVihat I claim as my invention and desire to secure by Ijetters4 Patent inthe United States of America is.:-.

1- li e tensioning, means. for` vibrating devices of the class specified, the combina# tion witha'box enclosure and a diaphragm therein, of a pivotally, mounted stylus vin the form of a beam having a hook at the outer extremity and an inner point engaging the center ofthe diaphragm, ofa cross member secured'to the beam and. pivotallyv connected to the box enclosure, an adjusting bar also carriedA by a portion ofthe box enclosure., and, a. looped.y wire engaging the hook of the stylus beam Axco nnectevd te the Seid adiiieting be.

2; In a device ofi'thfe'class speitied, the combination with al box enclosure having a diaphragm mounted therein anda rpivot'- ally mounted s tylus'bar provided. with a'n inner diaphragm-engaging extremity, of a wire loop engaging an outer portionoffthe Stylus bar. and.' adjusting means. Secured to. a portion ofx thebox enclosureand comprising an adjusting bar to which thefwire loop attached and-having a screw-threaded rodf for varying the tension of,L the wire lofopf-t'oV modify operative. ae'eoeietion of. the inner extremity of the. Stylus ban relatively to the., diaphragm.

3 11,1. e- Sound box for a sremophone- 0f the tyre deeerilied; the ooinliiiation'witha box enclosure a diapliranni;` therein and a stylus bar having pivotal connection with the edgey ofthe box enclosure and harina en iimerextremity movelely ensesing` the center of the diaphragm, of an adjusting means connected tbthle edge por? tion of the box encldsu're and comprisifngy a longitudinally, movable. screw.` rod' andfali` adjusting bar carried by said rod; and a wire loop applied around a portion of the outer extremity of the stylus bar and having its ends secured in the said adjusting Jar.

fl. In a sound box for a gramophone of the type described, the combination with a box enclosure having a diaphragm therein, a stylus bar pivotally connected to the edge portion of the box enclosure and having its inner extremity inovably engaging the diaphragm, a column secured to the edge portion of the box enclosure diametrically opposite said pivotal connection and having a screw-threaded rod shiftably mounted therein, the screw-threaded rod being provided With an adjusting cross bar, a Wire loop engaging a. portion of the outer extremity of the stylus bar and having the ends thereof removably secured in the ad juting bar, and a nut engaging the screw ro 5, In a sound box for a gramophone of the class specified, the combination With a box enclosure having a diaphragm mounted therein, of a stylus bar having a cross member 'adjacent its outer extremity pivotally connected to the adjacent edge portion of the box enclosure and also provided With a hook, a Wire loop engaging the hook at the outer extremity of the stylus bar, and an adjusting bar operatively associated with an opposite edge portion of the box enclosure and having the ends of the wire loop secured therein.

In testimony whereof I have hereunto set my hand.

HORACE HURM. 

